Equity-Based Compensation (Compensation Expense And Related Tax Benefit For Equity-Based Payments) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	$ 3,440	$ 3,098	$ 11,485	$ 10,048
Income tax benefit	1,217	1,069	4,003	3,467
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	287	218	820	755
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	511	333	1,271	1,107
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	374	343	1,196	1,037
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	$ 2,268	$ 2,204	$ 8,198	$ 7,149